Engine exhaust muffler



Jan. 22 1924. I 1,481,479

J. A. MURPHY ENGINE EXHAUST MUFFLER Filed July 2, 1921 2 Sheets-Sheet 1 INVENTOR. v Jmzs ,4. M/BPH X ATTORNEY5.

Jan. 22 1924. 1,481,479

- J. A. MURPHY" ENGINE EXHAUST MUFFLER Filed July 2, 1921 2 Sheets-Sheet.2

1 f f a A w flfi) 3 N, I Q? J ,2 O J D zz O INVENTOR. Inns: 4 flue/w.

. A TTORNEY$ Patented Jan. 22, .1924.

UNITED STATES PATENT OFFICE.

JAMES A. MURPHY, OF CONNERSVILLE, INDIANA.

ENGINE EXHAUST MUFFLER.

Application filed July 2,

ence being had to the accompanying drawings in which like numerals refer to like parts.

This invention relates to a mufiler or silencer and is especially adapted for use on internal combustion engines for silencing the explosion of the exhaust.

One feature of the invention relates to the construction of the involute exhaust passage, wherebythe discharged exhaust gases enter the muffler through a retracted passage which grows larger in cross sectional area toward the outlet, whereby the gases will be given room to gradually expand as their impulses are broken up and the exhaust seeks the outlet.

Another feature of the invention lie in the cutout construction formed integral with the mufiler adjacent the intake for discharging the exhaust directly into the atmosphere when it is desired to cut out the muffler from use.

Still another feature of the invention lies in the construction of the muflier embodying a perforated vertical partition separating the intake from the outlet, and causing the impulses from the exhaust to be further broken up, mixed and discharged in a constant stream.

The mufiler is provided with a by-pass I connecting the inlet with the discharge end of the mufller of a small area, for inducing a partial vacuum in the inlet end, thereby creating a suction effect upon the exhaust gases of the motor.

The full nature of this invention will be understood from the accompanying drawings and the following description and claims. a

In the drawin s Fig. 1 is a side elevation of the muflier. ig. 2 is a front elevation thereof. Fig. 3 is a cross section taken on the line 33 of Fig. 2. Fig. 4 is a cross section taken on the line 4-4 of Fig. 3. Fig. 5 is a cross section taken on the line 55 of Fig. 4 showing the by-pass between the inlet and outlet. Fig. 6 is a section taken on the line 6-6 of Fig. 2. Fig. 7 is the 1921. Serial No. 482,158.

same as Fig. 6 showing a modified form.

Fig. 8 is the same as Fig. 2 showing a modified form. Fig. 9 is a modified form showing another method of. forming a by-pass to produce the vacuum.

In the drawings there is shown a muffler I having an annular casing 10 with an inlet 11 and an outlet 12, said inlet and outlet I being tangential to the periphery of the casing 10, and oppositely disposed on said casing in alignment with each other. The inlet 11 is provided with the usual connecting flange 13 and is enlarged to permit of a cutout valve 14 being pivotally mounted therein at 15 in position to open and close the cut-out passage 16 communicating directly with the atmosphere.

The intake passage is reduced, as at 17, immediately filling the enlarged opening of the enlarged inlet passage. The exhaust passage extends to the inside of the casing 10 between said casing and the similarly curved inner wall 18. The wall 18 follows the contour of the casing 10 so as to form a volute passage therein, and is rounded, whereby the cross sectional area of said passage will increase as it extends about the annular peform a plurality of eddies in the current and 1 break up the impulses. The bafile plates comprise a plurality of inwardly and ra dially extending projections 19 formed integral with the inner periphery of the casing 10, a plurality of inwardly and angularly disposed baflle plates 20 formed integral with the inner involute wall 18, and a plurality of curved bafile plates 21 secured in said passage and extending horizontally thereof between the wall 18 and the periphery of the casing 10.

As the gas enters through the inlet 11, the cut-out valve 14 being closed, it strikes the reduced passageway 17 and a portion of it passes directly through the by-pass 22 to the outlet, thus creating a partial vacuum, while the main portion of the gases strike the baffle plates and are deflected and swirled into an eddy-forming motion as they pass about the passageway and until they make approximately an "entire revolution of the casing. As the algain approach the inlet they pass throug an opening in the partition 18, then enter an inner chamber 23.

The casing 10 abuts, and is joined to, a similar and oppositely disposed casing 24 which is formed with the outlet 12. The casings 10 and 24 are separated by the partitions 25 and 26 which are annular in form and held securely between them. Said partitions are provided at their center with the hemispherical partitions 27 and 28 which, when placed together, form a hollow sphere having a plurality of perforations 29. Upon the ases passing into the central chamber 23 t ey are blocked from further passage by the hemispherical partition 27, and are, therefore, forced to pass through the perfo rations 29. The gases then reach the central space enclosed by the central perforated tions 33 are formed on the inner wall 31.

Centrally positioned in the passageway of the exhaust 24 there are provided a plurality of baffle lates 34 and 35 positioned about to further reak up the direct current of the outgoing gases and cause said current to be deflected in varying directions. After passing through the assage in the casing 24 the exhaust gases nally reach the outlet 12 where they are discharged into the atmosphere. The projections 32 and 33 defleet the current of gases to the center of the passage where they strike the angular bafile plate 35 and are deflected laterally again toward the wall where they again strike the projections 32 and 33 and are projected inwardly against the concave surface of the battle plate 34 which gives them a swirling movement before they again prog ress through the passage. This constant deflection and bafiing further breaks up the current of gases so that the gases pass from the outlet inv a substantially single current without the plurality of impulses with which the gases enter the muflier.

In the modified form shown in Fig. 7, the construction of the casing 124 is similar in all respects to the casing 24, while the passage is arranged to contain projections 132 and 133 in all respects similar to the projections 32 and 33, and also the baffle plates 134 which are in all respects similar to the ba e plates 34, but the bafiie plates 35 are eliminated.

In the modified form shown in Fig. 3 the meagre inlet and outlet casings 10 and 24 are separatedby a central casing 36 inserted and secured between them, which is provided with a volute passage similar to that shown in Fig. 6, so as to take the exhaust gases discharged into the center of the mufiler bythe assaige in the casing 10, carry them one revo ution around the muflier and discharge them into the central opening or passage 30 of the casing 24. Such an intermediate casing is provided where it is desired to enlarge the exhaust mufiler and any number of such intermediate sections or casing 36 maybe used between the casings 10 and 24, depend ing upon the size of the mufller which is desired.

The by-pass 22 permits only a small portion of the gas to pass directly from the inlet to the outlet, and induces a current therethrough and causes a partial vacuum to take place at the outlet of the casing 10 for more readily drawing the exhaust gases into the muflier and acting against any back pressure. The by-pass may be constructed as shown in the modified form illustrated in Fig. 9, wherein the casings 10 and 24 are positioned adjacent each other, by punching out registering holes in the adjacent partition walls 25 and 26 and bending the punched out portions, as shown in Fig. 9, to form deflecting cars 37 and 38 for guiding the passage of the exhaust therethrough.

The invention claimed is:

1. A muffler adapted for use with gas engines and the like, comprising a casing having an inlet opening formed tangentially thereof, a tangentially formed and oppositely directed outlet opening, a passage. extending through said casing connecting said openings, and a plurality of curved baflle plates mounted substantially in the center of and horizontally with respect to said passagse.

2. A muflier adapted for use with gas engines and the like, a casing having an inlet opening formed tangentially thereof, a tangentially formed and oppositely directed outlet opening, a volute passage connecting said openings, said passage increasng in diameter from the inlet to the outlet, a lurality of bafile plates projecting inward y into said passage from the walls thereof, and a plurality of curved baflle plates mounted substantially in the center of and horizontally with respect to said passage.

3. A mufiler adapted for use with gas engines and the like, a casing having an inlet opening formed tangentially thereof, atangentially formed and oppositely directed outlet opening, a volute passage connecting said openings, said passage increasing in diameter from the inlet to the outlet, and by passes connecting the inlet and outlet of said mufiier, whereby a portion of the exhaust entering therein may pass directly out to .in said passage wvhereb passing therethrough Wlll be forced to pass the atmosphere for creating a suction at the outlet thereof.

4. A mufiler adapted for use with gas engines and the like, a casing having an inlet opening formed tangentially thereof, a tangentially formed and oppositely directed outlet opening, a volute passage connecting said openings, said passage increasing in sectional area from the inlet to the outlet, and a spherical partition member mounted in said casing between the inlet and outlet thereof having a plurality of perforations formed therein through which the exhaust gases must pass.

5. A muiller adapted for use with gas engines and the like, a casing having an inlet opening and an outlet opening therein, a volute passage between said openings through which the exhaust gases must pass, and a perforated spherical member mounted the exhaust gases throu h said member.

6. mufiler adapted for use with gas engines and the like, a casing having an inlet opening and an outlet opening, a circular passage connecting said inlet opening with the center of said casing, a circular passage connecting the center of said casing with the outlet, a partition dividing said casing in halves between said passa eways, and a spheric l perforated member ormed in said partitio enclosing a spherical chamber into which the exhaust gases must pass in their travel from the inlet to the outlet.

'7. A mufller adapted for use with gas engines and the like, a casing comprising a plurality of annular sections adapted to be mounted adjacent each other, an exhaust inlet formed tangentially with one of said sections and an outlet formed tangentially with another of said sections, an exhaust passage connecting the intake with the central portion of one section and a similar passage connecting the central portion with the outlet of another section, said central portions being open to each other when said sections are placed together, and a perforated partition mounted between said sections through which the exhaust gases must pass from the inlet to the outlet.

8. A mufiler adapted for use with gas engines andthe like, a casing comprising a plurality of annular sections adapted to be mounted adjacent each other, an exhaust inlet formed tangentially with one of said sections and an outlet formed tangentially with another of said sections, an exhaust passage connecting the intake with the central portion of one section and a similar passage connecting the central portion with the outlet of another section, said central portions being open to each other when said sections are placed together, a partition separating said sections, and a perforated spherical member mounted in said partition so as to form a spherical chamber therein into which the exhaust gases must pass from the inlet to the outlet.

In witness whereof I my signature.

JAMES A. MURPHY.

have hereunto afiixed 

